Boolean.valueOf(“TRUE”)==true//此處的引數true忽略大小寫

直接上原始碼：

/**
 * Returns a {@code Boolean} with a value represented by the
 * specified string.  The {@code Boolean} returned represents a
 * true value if the string argument is not {@code null}
 * and is equal, ignoring case, to the string {@code 
 
"true"}.
 *
 * @param   s   a string.
 * @return  the {@code Boolean} value represented by the string.
 */
public static Boolean valueOf(String s) {
    return toBoolean(s) ? TRUE : FALSE;
}

private static boolean toBoolean(String name) {
    return ((name != null) && name.equalsIgnoreCase("true"
 
));
}

熟悉C語言的人都知道，C裡面0是false，其餘的非零數值都是true
java裡面也有一個方法用來實現從string型別轉到boolean型別，但是更加簡單粗暴，
Boolean.valueOf(“true”)//此處的引數true忽略大小寫
其他的值都是false，詳見上面原始碼